Arnold for Cinema 4D Forum
Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Transfer a color attribute from houdini to c4d

Message 1 of 5
2230 Views, 4 Replies

Transfer a color attribute from houdini to c4d


I've imported a particles simulation from houdini to c4d with 3 attributes: Cd, P and pscale; after that i set up an xpresso rig to read those attributes, and put an arnold tag and a standard shader to my alembic.

As far as the pscale everything works fine, but when i try to connect a user_data_rgb with "Cd" as my attribute, the color shown is the default one, it seems it cannot read that input.

The thing is, i can clearly see the different particles color in the viewport and in my thinking particles channel, i see the Cd(vector) listed.

Can anyone help me out? Thanks


Labels (3)
Message 2 of 5
in reply to: Anonymous

I assume you are using the Arnold TP Group object to render Thinking Particles. It has a field, called Export channels, where you have to define which channels you want to export to Arnold. Did you define Cd there?

Message 3 of 5
in reply to: Anonymous

@Peter Horvath I was using an arnold tag on my alembic, but using a TP group solves the problem, thanks!

I do have another problem however, in the ipr the scale of the particles is correct, but when i render they all have the same size. I tried to add a pscale attribute in the tp group and put a user_data_float node in my shader network, but i'm not really sure where to connect it.

Message 4 of 5
in reply to: Anonymous

It's strange that it does not work in the render. Maybe it's an issue when the xpresso network is evaluated. Xpresso tag has a Priority option, you can try to change it if it helps. If it does not, can you send me your scene to take a look?

Message 5 of 5
in reply to: peter.horvath6V6K3

Changing the priority option to animation and then back to initial, solved the problem, thanks!

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums  

Technology Administrators